Inventory Update Solution - Too simple?

Tell us what’s happening:
Hey guys! First of all I’m really happy I discovered this platform where I could further expand my knowledge(mostly of JS I’m familiar with HTML/CSS but not very interested in them).

Anyways I just finished the Inventory Update and was wondering if my my solution was too simple for the problem. I’m fairly good in Lua and I just took the easiest and fastest approach I could think off.

Your code so far

function updateInventory(arr1, arr2) {
    //Join both arrays
    for (var key in arr2) {
        arr1.push(arr2[key]);
    }
    //Add up recurring items and remove duplicates
    for (var key in arr1) {
        for (var otherKey in arr1){
            if (arr1[key][1] === arr1[otherKey][1] && key != otherKey){
                arr1[key][0] += arr1[otherKey][0];
                arr1.splice(otherKey, 1);
            }
        }
    }
    //Sort alphabetically
    arr1.sort(compareSecondColumn);
    function compareSecondColumn(a, b) {
        if (a[1] === b[1]) {
            return 0;
        }
        else {
            return (a[1] < b[1]) ? -1 : 1;
        }
    }
    return arr1;
}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/coding-interview-prep/algorithms/inventory-update/